snor·kel /ˈsnɔrkəl/
  潛艇換氣裝置
  snorkel
       n 1: breathing device consisting of a bent tube fitting into a
            swimmer's mouth and extending above the surface; allows
            swimmer to breathe while face down in the water
       2: air passage provided by a retractable device containing
          intake and exhaust pipes; permits a submarine to stay
          submerged for extended periods of time [syn: schnorkel,
          schnorchel, snorkel breather, breather]
       v : dive with a snorkel